VIEWING ANGLES IN SOME SELECTED BL LAC OBJECTS

A selected subset of BL Lac objects were monitored with VLBI technique s at multi-frequencies. Apparent superluminal motion and X-rays were d etected in all of the monitored sources. From the observational data, kinematic parameters, geometric parameters and beaming effects for the 'core' of the selected BL Lac objects have been estimated. Our result s indicate that some BL Lacs have large Lorentz factors and small view ing angles; relativistic beaming effects are strongly present in these sources. On the other hand, some BL Lacs have small Lorentz factors; their viewing angles are quite large. It does not seem possible to avo id the fact that some BL Lac objects are not oriented particularly clo se to the line of sight. It conflicts with the basic assumption of the accepted theories for explaining the characteristics of BL Lac object s at present. Also, it seems that the BL Lac objects in the class I of the Burdige and Hewitt's classification have larger viewing angles th an those int he class II. The whole BL Lac classification could be a m isnomer: the sources classified as 'BL Lac objects' are a mixture of p hysically different populations with different parent objects.